adding new test for --fixture-graph

Author: Israel Fruchter (ifruchte)

tests/test_fixtrue_graph.py

@@ -0,0 +1,35 @@
+import py
+
+
+def test_fixture_graph_created(testdir):
+    """Check that --show-fixture-duplicates will give us list of duplicates."""
+    sub1 = testdir.mkpydir("sub1")
+    sub2 = testdir.mkpydir("sub1/sub2")
+    sub1.join("conftest.py").write(py.code.Source("""
+        import pytest
+
+        @pytest.fixture
+        def arg1(request):
+            pass
+    """))
+    sub2.join("conftest.py").write(py.code.Source("""
+        import pytest
+
+        @pytest.fixture
+        def arg1(request):
+            pass
+    """))
+    sub1.join("test_in_sub1.py").write("def test_1(arg1): pass")
+    sub2.join("test_in_sub2.py").write("def test_2(arg1): pass")
+
+    result = testdir.runpytest_subprocess('--fixture-graph', '-s')
+
+    result.stdout.fnmatch_lines("created at artifacts/fixture-graph-sub1-test_in_sub1.py__test_1.dot.")
+    result.stdout.fnmatch_lines("You can convert it to a PNG using 'dot -Tpng artifacts/fixture-graph-sub1"
+                                "-test_in_sub1.py__test_1.dot -o artifacts/fixture-graph-sub1-test_in_sub1"
+                                ".py__test_1.png'")
+
+    result.stdout.fnmatch_lines("created at artifacts/fixture-graph-sub1-sub2-test_in_sub2.py__test_2.dot.")
+    result.stdout.fnmatch_lines("You can convert it to a PNG using 'dot -Tpng artifacts/fixture-graph-sub1"
+                                "-sub2-test_in_sub2.py__test_2.dot -o artifacts/fixture-graph-sub1-sub2-te"
+                                "st_in_sub2.py__test_2.png'")